Update link for Read Ruby

index.html

@@ -166,7 +166,7 @@ <h2>Learning Ruby and Programming</h2>
 <li><a href="http://rubylearning.com/satishtalim/tutorial.html">Ruby Learning</a> - Ruby tutorial</li>
 <li><a href="http://railsforzombies.org">Rails for Zombies</a> - learn Ruby and Rails in your browser, no setup required</li>
 <li><a href="http://ruby.learncodethehardway.org/">Learn Ruby The Hard Way</a> - a Ruby translation of Zed Shaw's "Learn Python The Hard Way"</li>
-<li><a href="http://ruby.runpaint.org/">Read Ruby</a> a book about Ruby, quite technical but well written. Free online.</li>
+<li><a href="http://readruby.io/">Read Ruby</a> a book about Ruby, quite technical but well written. Free online.</li>
 <li><a href="http://github.com/alexch/mission">Ruby Mission</a></li>
 <li><a href="http://groups.google.com/group/railsbridge">RailsBridge</a></li>
 <li><a href="http://www.csunplugged.org/">CS Unplugged</a> - "CS Unplugged provides an extensive collection of free resources that teach principles of Computer Science such as binary numbers, algorithms and data compression through engaging games and puzzles that use cards, string, crayons and lots of running around."</li>